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Nov. 26, 1929-. w. E. PRESCOTT 1,736,863

PUMP OF WAFER BISCUIT AND SIMILAR MACHINES Filed Sept. 26, 1925 Y 4 Sheets-Sheet l mam/7m:

WILLIAM EDWARD PREscoTT Nov. 26, 1929. w. E. PRESCOTT PUMP OF WAFER BISCUIT AND SIMILAR MACHINES 4 Sheets-Sheet 2 Filed Sept. 26, 1925 WILLIAM EDWARD PRESCOTT.

WO/W' W Nov. 26, 1929. w. E. PRESCOTT PUMP OF WAFER BISCUIT AND SIMILAR MAQHINES Filed Sept. 26, 1925- 4 Sheets-Sheet 3 Q Rm mm a 1 N N a m m Ill MW NW Nov. 26,. 1929 w. E. PREscoTT PUMP'OF WAFER BISCUIT AND SIMILAR MACHINES Filed Sept. 26, 1925 4 Shets-Sheet 4 WILLIAM EDWARD Paascon.

ATTORNEY. m

Patented Nov. 26, 1929 wILLiAM EDWKR'D PRESCOTT, or LonnoN, MENTS, TO BAKER PERKINS COMPANY I men on NEW YORK PUMP or WAFER-BISCUIT Application filed September 26, 1925, Serial No.

This invention relates to pumps for wafer biscuit and similar machines and more particularly to those in which batter or the like is pumped from a container through a discharge nozzle to between heated baking plates or moulds which are opened to receive the batter and then closed, the said nozzle being moved between the plates for delivery of the batter and then removed, the delivery and out off of the batter being in required timed relation with the opening and closing of the plates.

In machines of this class hitherto known, difficulty has been experienced in preventing the batter or the like from dripping from the nozzle after the required quantity delivered by the pump to the moulds has ceased, and the present invention comprises means for preventingsuch drip by withdraw ing from the nozzle, by auxiliary pumping or suction means, that quantity of batter, or so much thereof, as remains in the nozzle or connections as would cause the drip to occur.

In one embodiment of the invention more particularly as applied to a main pump, suitably of the rotary type, which delivers the batter through a supply pipe and a swinging arm to the discharge nozzle, there is provided either in communication with the supply pipe, or overflow therefrom, or with the swinging arm, or in any other part of the system which will not interfere with the supply to the nozzle, an auxiliary pump-chamber containing a plunger or piston which, whenthe delivery stroke or operation of the main pump ceases, is operated to exert a reverse flow or suction in the system to draw back the batter from the nozzle and prevent the objectionable drip referred to. Such auxiliary pump may be branched off from whatever part of the system it is applied to and be operated from the same cam or other operating; means as the main pump with independentconnections, or in any other suitable or approved manner? The said auxiliary pump is also so" controlled that its plunger returns to normal position before or during: the commencement of the main delivery stroke so that it merely temporarily retains ENGLAND, AssIenoR, P, Y Mnsnn ASSIGN- NC., OF SAGINAW, MICHIGAN, A CORPORA- AND sIMILAR MACHINES 58,702, and in Great Britain November 5, 1924.

the drawn back batter and allows same to again mingle with the next quantity delivered to the nozzle.

In another embodiment of the invention as applied to a main plunger pump adapted to slide as a whole with the nozzle in the movements of the latter between and away from the plates or moulds, the same principle as above described may be em ployed by locating the auxiliary pump in communication with the batter discharge pipe or at a position beyond or behind the delivery valve usually present and providing operating means for the plunger controlled by the reciprocating movements of said sliding main pump.

The two embodiments of the invention referred to aboveare illustrated in the ac companying drawings in which Fig. 1 is a side elevation showing more or less diagrammatically the general arrangement of one form of the pump and batter feed device. Fig. 2 is a plan view of Fig. 1. Fig.3 is an end elevation of Fig. 1. Fig. 4: is a plan view of the auxiliary pump chamher and associated parts. Fig. 5 is a section of Fig. 4 on the line 55. Fig. 6 is a sectional detail view of parts shown in Figs. 4t and 5. Fig. 7 is a plan view showing the general arrangement of the second form of apparatus and Fig. 8 is a partial section on line 8-8 of Fig. 7.

To refer firstly to the form shown in Figs. 1 to 6, 1 designates in outline a wafer mould or plate onto which the from a multiple nozzle 2 as the plate moves along as is customary in the to which this invention applies. The said nozzle 2 is carried by a pipe 3 which is caused to swing about the axis 4* of an oscillating batter supply pipe 4 either into the feeding position shown in full lines in Fig. 2 or into the broken line positionof this figure in which it is shown over a funnel 5 to receive any drippings from the nozzle.

The means shown by which said pipe 4 is given its oscillation to produce the swinging movement of the pipe 8 and nozzle comprises a pinion 6 carried by the pipe and engaging a sliding rack 7 which is reciprocated' by batter is deposited class of machine IUD means of a link 8 having a roller 9 engaging a cam path 10 in a gear-Wheel 11 forming part of the main driving gear of the apparatus. The batter is fed to the supply pipe 4 and nozzle 2 by means of a pump 12 of the rotary type which is driven through gearings 13, 14 and 14 from the gear-wheel 11 aforesaid. The batter is drawn from a tank 15 through pipe 16 to the pump and excess of batter is returned from the supply through a pipe 17 back to said tank.

The apparatus so far described is common to the class of machine under consideration and may be modified or varied according to requirement, but as applied to such apparatus the invention consists in providing in said batter supply means an auxiliary pump 18 positioned at the top of the supply pipe 4 and taking part in its oscillating movements. The details of this auxiliary pump are clearly shown in Figs. 4 to 6 from which it will be seen that the chamber 19 communicates at one end with the pipe 4 and is adapted for connection at the other end with the nozzle pipe 3 by means of a flange coupling 20. The pump-chamber contains a plunger 21 passing through a gland 22 in the wall of the chamher and carrying at its outer end a cross-head 23 provided at its inner end with a roller 24 which cooperates with one surface 25 of a cam member 26 extending laterally from the apparatus. The crosshead' 23 is guided by means of two rods 23 extending from a head 23 forming part of the pump chamber casting, said rods being shown as provided with heads 23 which will limit the movement of said crosshead when the roller 24 passes beyond the limitof the cam face 26*. Thus as the pipe 3 and nozzle 2 swing towards the drip position (broken lines Fig. 2) the roller 24 will travel along the cam-surface 25 until a point 2. thereon is reached, this action causing downward movement of the plunger 21 (Figs. 4 and 5) and causing any superfluous batter which would cause dripping at the nozzle to be withdrawn into the pipe 3 immediately after the deposit or feed onto the mould. During continued swinging movement of nozzle pipe 3 in the same direction, to the end of its'stroke, the roller will follow idly in the remaining portion of the cam 26, then upon return swing of the nozzle pipe 3 the lateral surface of the roller will bear against the face 26 of the cam 26 and also against an inclined face 27 of a second cam member 27? housed in a recess 28 of the support 29 for the batter pipe 4 and under the action of a spring plunger 30 which tends to force said cam outwards.

The cam 27 is also provided with a second inclined or oblique face 31 and the action is such that when the roller is returning as above stated it will first ride over the cam 27 depressing the same against the action of the spring plunger .30 and pass beyond said cam and will, on the next movement in the'depositing direction, engage the face 31 of the cam to return the pump plunger 21 and restore the batter previously sucked back to the batter pipe, this action however not taking place until the nozzle is in position to deliver a fresh charge of batter on the next mould or plate and deposit is about to take place again. p 1 1 In the embodiment illustrated in Figs. 7 and 8 the invention is shown as applied to apparatus including a pump of the known sliding kind. In these figures 32 designates a pump of the duplex type adapted to be reciprocated on a guide 33 by any appropriate means. Pipes 34, each carrying a nozzle35, are mounted in a casting 36 carried by the pump and deposit the batter on the plates or moulds 37 during movement of the latter towards the left and whilst the pump is moving towards the right (Fig. 7). A branch pipe 38 extends from each of the nozzle pipes 34 to the auxiliary pump chamber 39 which is mounted laterally of said pipes, this chamber containing a plunger 39 to which is attached a rod 40 which extends outside the pump chamber at each end. Supported by bearings 41 in which the aforesaid guide 33 is mounted are brackets 42, 43 carrying respectively adjustable abutments 44, 45 adapted to be alternately engaged by opposite ends of the plunger rod 40. during the reciprocation of the pump 32. Thus when said pump is moved to the right (Fig. 7) and the rod 40 engages the abutment 45, the auxiliary plunger 39 will be operated in one direction causing suction to take place in the nozzle pipes 34 immediately the deposit of the batter on the mould has been completed and thus preventing dripping of the batter. On the return stroke of the pump the opposite end of the plunger rod 40 will engage the other abutment 44 which reverses the movement of the plunger 39 causing the batter previously sucked back to be again forced into the nozzle pipes 34 previous to commencement of afresh deposit, together with a fresh charge delivered by the main pump.

lVhat Iclaim as my invention and desire to secure by Letters Patent of the United States is 1- i i 1. In feed mechanism for food machines, the combination with a nozzle adapted: to deposit wafer material in an associated mould and movable to and away therefrom, and a pump for. supply of Wafer material to said nozzle, of an auxiliary pump adapted to withdraw or reverse the flow of wafer material in said nozzle immediately deposit has taken place in order to prevent drip of material from said nozzle, and common operating means for both pumps aforesaid.

2. In feed mechanism for food machines, the combination with a nozzle adapted to deposit wafer material in an associated mould and movable to and away therefrom, and a pump for supply of wafer material to said nozzle, of an auxiliary pump adapted to withdraw or reverse the flow of wafer material in said nozzle immediately deposit has taken place in order to prevent drip of ma terial from said nozzle, and common operating means for both pumps aforesaid, said auxiliary pump operating means being operated from said common operating means by movement of the nozzle to and away from the mould.

3. In feed mechanism for food machines, the combination with a nozzle adapted to deposit waier material in an associated mould and movable to and away therefrom, and a pump for supply of water material to said nozzle, of an auxiliary pump adapted to withdraw or reverse the flow of water material in said nozzle immediately deposit has taken place in order to prevent drip of material from said nozzle, and means for operating said auxiliary pump controlled by movements of the nozzle to and away from the mould.

4. In feed mechanism for food machines, the combination with a nozzle adapted to deliver wafer material in an associated mould and movable to and away therefrom, and a pump for supply of water material to said nozzle, of an auxiliary pump adapted to withdraw water material from said nozzle immediately after deposit has taken place, and redeliver said material to the nozzle on the succeeding deposit and means for operating said auxiliary pump comprising cam mechanism controlled by movements of the nozzle to and away from the mould.

5. In feed mechanism for food machines, the combination with a nozzle adapted to deposit wafer material in an associated mould, and a pump for supply of wafer material to said nozzle, of an auxiliary pump adapted to withdraw or reverse the flow of wafer material in said nozzle immediately deposit has taken place in order to prevent drip of material from said nozzle, and common operating means for both pumps aforesaic.

6. In feed mechanism for food machines, the combination of a nozzle adapted to deposit wafer material in an associated mould, main means for supply of wafer material to said nozzle, auxiliary means adapted to withdraw or reverse the flow of wafer material in said nozzle immediately deposit has taken place in order to prevent drip of material from said nozzle, said auxiliary means also acting to redeliver the Withdrawn wafer material to the nozzle at the succeeding depositing operation and common operating means for said main and auxiliary supply means.

7. In feed mechanism for food machines, the combination of a nozzle adapted to deposit wat'er material in an associated mould, means for moving the nozzle to and in relation to the mould, a pump for supply of wafer material to said nozzle, an auxiliary pump adapted to withdraw or reverse the flow of wafer material in said nozzle immediately deposit has taken place in order to prevent drip of material from said nozzle, and operating means for said auxiliary pump controlled by movement of the nozzle in relation to the mould.

8. In feed mechanism for food machines, the combination of a nozzle adapted to deposit wafer material in an associated mould, means for automatically moving said nozzle in relation to the mould for depositing wafer material thereover, a main pump system to deliver wafer material to said nozzle, an auxiliary pump branched from the aforesaid pump system and adapted to withdraw or reverse the flow of water material in said system, and redeliver said withdrawn material to the nozzle at the succeeding'depositing operation, said auxiliary pump being operated in conjunction with operating means for the main delivery system.

9. In feed mechanism for food machines, the combination with a nozzle adapted to deposit wafer material in an associated mould and movable relatively to the mould, and a pump for supply of water material to said nozzle, of an auxiliary pump adapted to withdraw or reverse the flow of water material in said nozzle immediately deposit has taken place in order to prevent drip of material from said nozzle, and means for operating said auxiliary pump controlled by movements of the nozzle relatively to the mould.

10. In feed mechanism for food machines, the combination with a nozzle adapted to deliver wafer material in an associated mould and movable relatively thereto, and apump for supply of water material to said nozzle, of an auxiliary pump adapted to withdraw wafer material from said nozzle immediately after deposit has taken place, and redeliver said material to the nozzle on the succeeding eposit and means for operating said auxiliary pump comprising cam mechanism controlled by movements of the nozzle relatively to the mould. V

In witness whereof I have signed this specification.

WILLIAM EDWARD PRESCOTT. 

